my combo is lt1 intake, ported zz4 heads (l98 heads with lt4 springs) solid roller cam Advertised Duration IN/EX: 282/290 Duration @.050 IN/EX: 224/232 Gross Valve Lift IN/EX: .502"/.502" Lobe Sep Angle / Intake Ctr Line: 112/108
compresstion about 10.5:1 363 cu in . i am wondering if the stock computer will work good enough for me to get it started without any issues and if it will work how much tunning would it need?

if anyone has a similar combo id appreciate any feedback. im trying to decide if i should buy stuff to burn my own chips or just buy an aftermarket pcm

 

If the stock programming was initially for a 350, it would probably be adequate to at least get teh engine started and running. There may be a tendency to be lean, due to the smaller injector pulses required for a 350. However, depending on the overlap of the cam profile (and resultant vacuum/MAP), it may also run a bit rich due to a higher MAP reading which could "fool" the ECM into an enrichment more because of a presumed load.

In any event, I would strongly suggest a data cable, PROM writer, editing software, and data logging software for you to develop your own custom program. A very good place to start searching is at Mark Mansur's site:
http://gmecmedit.markmansur.com/

A good place to find useful hardware and cabling is Craig Moates' site:
http://www.moates.net/

 

thanks for the links