Hi
I have a little 350 small block chevy. The only modification I made is a

Camshaft with lift:477/480 and duration@50: 224/231.
Valve spring that fit with my cam
make 3 angle valve seat and 2 angle on valve
I got a pair or 882 heads
aluminium intake
for the rest it is almost stock
I have no high stall torque converter
3 speed automatic th-350
run on manifold for the moment but I plan to have it

Now, somebody told me that it will be better if I put a vacuum secondary, but I've got in mind to put a holley 4150 650cfm mechanical secondary double pumper

Is it good or bad ??
Any Carb suggestion ??
Thanks at advance guys!!