Thanks, all. I have a rebuilt 650 double pumper on there now, and I think the mechanical secondaries make it bog a bit. Just want something reliable, but ample enough in cfm that I can carry it over if I decide to boost h.p. in the future.
I agree with post 7, however, tune your 650 DP and get the bog out. It's in the tune. I've had 750 DP's on very mild 318's with stock converter and no bog. Again, it's your tune.
