A good friend of mine has given me a 350 Crate motor with around 35,000 miles on it.

The block ID is 10066036 which decodes to 1994, 350, Goodwrench crate motor, 2 piece rear main seal, “Hecho en Mexico”.

The heads ID is 33417369 which decodes to 1990-up 350, Gen. 1 Goodwrench crate motor, “Hecho en Mexico”, 76cc.

Any idea on the horse power and compression ratio.

I’ve got a 305 in my 1986 Silverado. I’ve had a Holley 670 cfm Pro-Jection installed on it.

I figure that the 350 can’t get any worst gas mileage.

The 350’s got an Edelbrock Performer RPM manifold.

What are some performance upgrades could I do without hurting the mileage?

I was thinking about headers and a small cam.

Which ones would y’all recommend?

Would I be better off with a carburetor?

Thanks for any help.