They are enough to feed a 396, but if he is willing to ditch the stock computer then a high rpm 383 would be nasty with a big pair of AFR heads .

 

im not keeping the 503 in the 383 loolol . im doin a solid roller custom grind in it . runnin a piggyback computer so i can rev past 7k along with a single plane intake converted for e.f.i . i only wondered what they would do on a 358 cause they came off of a procharged 355

 

Makes no sense to install them on your current motor now...definitely hold off. On your new motor however they should compliment it nicely. Good luck.

 

i hope so lol i just looked though its a lt1 ontake that has been port matched to a lt4 ,is that possible ?????lol

 

Check the casting number. Yes lt1 and lt4 Can be welded up/machined to fit either or.