Thermoquads and tall spacers

A near stock 360 Magnum.Headers,airgap manifold.(center divider milled,worked plenum)3.55 gears,9.5 converter(real world 2800-3200 flash hit.Cam:Crower hyd roller,284 adv duration.At. 050,224,.491 lift.20 inches of vac @800 with timing 16 initial,34 @ 3000.I am thinking T/Q,3 Holleys I have tried don't feel right.I can make a 1 to 2"spacer,no problem.How bad does the tall spacers throw off T/Qs?Thanks,in advance,Tim:prayer: