My what will it run?

Just noticed,you said intake "welded square flange,and ported".Usually,this points towards,a Holley Dominator carb. Are you running the 750 Dominator?

You may be right on that carb? I'm not sure on the weldin' & portin' but i was thinking a Victor 340 would be a good intake and maybe a 850....DP or Hp? Being it looks to be a mainly track car with a pretty good size stall.

I don't know, getting late and i'm too tired to think anymore..............lol.