Any machine shop gurus out there? Here's what I'm working on. About 3 years ago put together a '96-00 L31 Vortec crate motor for a blazer repower. Was a new GM crate motor, installed the "hot cam" kit, .525/525 lift with 1.6:1 self-aligning roller rockers with duration in the 218/220 range @.050 lift. R&R heads and had the spring pockets opened up and towers turned down for seal clearance. Installed Performer RPM intake and performer 750carb. With about 9.5:1 compression and proper tune it should have been in the 400HP range. Now up to current speed, truck was rolled and burned. Redoing engine and owner wants closer to 500hp . So in fire carb melted, MSD billet dist, gear drive starter and all accesories toast. Going with Edelbrock Etech 200 heads, flow better than GM fast burns. RPM air gap intake, maybe a 1460 series holley 750 that GM uses on the 430hp/350. Also looking at the Edelbrock RPM roller cam, .560/.580 range and CompCams chromemoly 1.5 rockers. Now machining question. Looking at decking the block. All pistons measure .026-.030" below deck height. How much can a stock block reliably be decked? Don't want to, at this point, get into offset bushing the piston pins to raise them to the top of the deck.