I am Blackroc's friend. The old springs were Comp 954s. They tested 140-160. I ordered K-Motion 900s now and am planning on doing a leakdown test as well. Here are the car specs (taken from another forum). Nothing too exotic. I tried to build something that would make decent power and last a while. Like Blackroc said, the motor sees pretty limited RPMs.




Engine:
Type: 406 cid small block chevy
Block: 400 chevy, 2-bolt main caps
Pistons: Forged SP flat-tops
Rings: Moly
Rods: Forged 5.7" Eagle I beam, ARP capscrews
Crank: Cast, 3.75" GM, 400 mains
Compression Ratio: 11.0:1
Cylinder Heads: Air Flow Reseach 195cc, CNC ported, screw in studs, ARP bolts, AFR guide plates
Valve Size: 2.02"/1.60"
Camshaft: Comp custom solid roller 236*/242* @ .050", .614"/.629" gross lift, 108* LSA
Valve Train: Comp solid roller lifters-vertical link bar, Comp Hi-Tech chromemoly pushrods, Proform aluminum stud girdle, Crane Gold 1.6 Roller Rockers, Cloyes True Roller double timing chain
Intake: Edelbrock RPM Air-Gap
Carb: Barry Grant Speed Demon, 750cfm, mechanical secondaries
Ignition: MSD Digital 6 Plus ignition box, MSD Pro Billet distributor, MSD Blaster SS coil, Jacobs 8.5mm wires
Engine Fasteners: ARP
Fuel System: Holley Blue 140gph pump, Proform 160gph filter, Holley adjustable fuel pressure regulator
Cooling: Griffin 31"x19" aluminum rad, stock electric fan
Exhaust: Hooker Super Comp 1-3/4" long tubes, custom 3" Y-pipe, 3" single, Flo-Pro muffler
Other: Balanced & blueprinted rotating assembly, GM mini-starter
Machine Work: Northside (Saskatoon)
Engine Builder: Kelly Solheim

Drivetrain:
Transmission: TH350, Trans Go shift kit, B&M HD tranny cooler
Converter:JW, 9.5", 4200rpm
Drivehaft: Stock, heavy duty Rockford U-Joints
Rear End: Moser 9", aluminum center section, detroit locker, 3.89 pro street gears, 35 spline axles

Chassis:
Front Suspension: Stock
Rear Suspension: Stock type with Hotchkis tubular adjustable panhard bar, boxed control arms, Air Lift air bags
Other: Custom subframe connectors
Front Brakes: Powerslot slotted rotors, Hawk Racing ceramic pads
Rear Brakes: LT1 Disc converson, Hawk Racing ceramic pads
Wheels & Tires:
Front: Stock 15x7" rims, 235/60 BFG Radial TAs
Rear: Stock 15x7" rims, 28x11.5 ET Streets

Body & Paint:
Body: Stock
Paint: Stock scheme - electric blue metallic with silver trim

Interior:
Seats: grey leather, 92 GTA
Guages: stock with 2-5/8" mechanical Auto Guage water temp and oil pressure in AC vent location

Performance:
Best ET: 11.719@115.14mph, 1.659 60' (uncorrected, 2900' DA)