Long Time Diy EFI Lurker

[stew86MCSS396]

Hi Everyone. Been following diy EFI for a long time but never did anything with it. Anyhoo...bro has a 1993 Chevy truck with a tired 305. Helping him swap to a 350 .040 Vortec heads, L98 cam, BBC 74# injectors and shorties. Looking to swap the stock ECM to a 747. Came here because I realized I don't have any $42 xdf or bins for that matter. I'm really a newbie when it comes to this and hoping to get some guidance. As for me, I wanted to put a L29 intake on top of my BBC 396 in my Monte Carlo SS that currently hasn't materialized. C ya!

[stew86MCSS396]

As stated above but bro's truck is a 1992. Started just fine on the oem '299 computer but very rich. Swapped to '747 ecm w/ 5.7 manual truck bin EGR delete and changed BPC to 115 for 74# injectors. Much better smell at the exhaust. Didn't put a scanner on it and sent him home with that. I know, I know what am I waiting for. There's way more on the table since we're talking peanut cam vs. L98. He just notified me he had issues climbing a grade.My thoughts for hit it out of the ball park tune is to start with a L98 cam bin, however closest thing to that would be '746 Caprice cop car. Only wiring difference between the two, is the IAT/MAT sensor. Tried comparing the VE tables and very different. Internet searches had varying opinions of what the IAT does. Am I wrong to think I can import the '746 map into a '747 map? Another possible route is take the deleted EGR wiring repin A4 to C12 and run with the '746 sans EGR and BPC change. I know it still needs to be tweaked for the vortec heads but just wanted to kick some ideas around before the week ends and I won't see him til next week.

[stew86MCSS396]

Oops!