What size carb do you reccomend for an 700R4 with 3.73's

 

I also have a CC305 cam and AFR190 heads

 

What torque converter?

Which carb type you should get depends a lot upon intended usage. For the street, a vacuum secondary is pretty forgiving. If you race it regularly, you should consider a mechanical secondary double pumper.

If you follow Holley's recommendations, you don't need any more than a 650 (see this post and the link within https://www.thirdgen.org/techbb2/sho...hreadid=192658 ). If you only have a stock torque converter, 750 is stretching it for a double pumper (check out this post https://www.thirdgen.org/techbb2/sho...hreadid=192317 and the link within for sizing a DP).

This is all assuming you go with a Holley. The same principles apply to a Demon. If you're thinking Edelbrock Performer, I'll decline recommendations because I've never had one and haven't seen a convincing arguement as to why anyone should buy one.

 

Oops, read my own link only to discover the link is missing.

Here's the missing link for carb sizing:

http://www.holley.com/HiOctn/ProdLin...FMSC/FMSC.html

 

OK, thanx.

I currently have a Street Avenger 770, can I make this work if I do some reworking on it?

 

It's a vacuum secondary type. Shouldn't take any reworking, just tuning. Jetting the secondaries is difficult on that particular type, but the way it comes is typically close.

Adjust the idle, jet the primaries, adjust the secondary spring to get rid of bog, it'll be fine.