1 3/4 or 1 7/8 headers will bring back some low end/mid range and part throttle response.850 vacuum secondary isn't too big but a 750 with the smaller throttle bore would help the responsiveness also.
I would keep the rpm intake,any other dual plane is a step down.
That cam should be fine but you can advance it 2-4 degrees for more bottom end.
The more work on the heads(air flow)will help everything.No reason that thing shouldn't fry the tires.
Make sure the timing is right as well.
Same opinion here regarding the headers, 2" are for drag racing.
I might have a 750 vac and that would be fully enough, I agree again.
I was wrong on the heads, they are 452's.
Timing was set to 35 degrees fully advanced w/o vacuum. I know I have the curve somewhere, will look for it. I have to admit I'm not a ignition guru. I always try to have as much advance as possible without pinging...
