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Moving up one point in static compression ratio will add 4% power, so you will only pick up 4% power going from 9.0 to 10.0 or 9.5 to 10.5:1, but it will require big bucks for aluminum heads. Not worth it. Stay with the iron heads and build it 9.0:1 to 9.5:1 so you can use 87 or 89 octane pump gas.
Bore the block 0.030" and use these pistons....
https://www.uempistons.com/index.php...roducts_id=506
If you don't like these pistons, use another piston of your choice, but do not buy pistons that have less than 1.645" compression height or less than 12cc pop-ups.
Have your machinist check the block decks and head decks for being flat so that the motor will not spit out these Mr. Gasket steel shim head gaskets....
Mr. Gasket 1131G, Mr. Gasket Steel Shim Cylinder Head Gaskets | Mr. Gasket

Your stack of parts will measure 9.780". The block deck height is 9.800". This will leave your piston down in the bore by 0.020" with the piston at top dead center. With the Mr. Gasket shim steel head gasket (0.018" compressed) added to the 0.020" piston deck height, your squish will be 0.038". Your combustion chambers are probably ~118cc's, (post the cylinder head casting number so we can make sure) so the static compression ratio of the motor will be 9.2:1. It should produce an easy 450 hp, operate detonation-free on 89 octane pump gas and pull like Jack the Bear with this Howards retro-fit hydraulic roller cam and roller lifters....
Howards Cams Retro-Fit Hydraulic Roller Camshaft and Lifter Kits CL120235-12 - Free Shipping on Orders Over $99 at Summit Racing
At the bottom where it says 9.0:1 static compression ratio advised, it means at least 9.0:1........This cam should also allow enough manifold vacuum to operate your power brakes really well.

Bolt on a set of 1 7/8" or 2" primary headers, long-tube (not those cheezy shorty headers) with minimum 3/8" flange thickness. Thinner flanges will warp up like a potato chip from the heat and spit the gaskets out. Install an X or H pipe immediately after the collectors and run the pipes and mufflers to the rear bumper of the truck. Nothing sounds quite so Ricky Racer as pipes that are terminated under the vehicle and resonating on the sheet metal.

Use this intake manifold, NOT THE AIR GAP MODEL, and mount a 750-800 CFM carb of your choice, topped with a 14" diameter by 4" tall air filter assembly so the motor can breathe.
Edelbrock Performer RPM Intake Manifolds 7161 - Free Shipping on Orders Over $99 at Summit Racing
This Weiand unit is also an excellent intake manifold....
Weiand Stealth Intake Manifolds 8019 - Free Shipping on Orders Over $99 at Summit Racing

Any of these dual-plane, high-rise intake manifolds will work great street/strip.

The relatively mild cam should coordinate well with your torque converter and stock rear gears.

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