TT Dart -- Brainstorming

for your basic goal...( 1 ) MasterPower T70 is all you need....check the price on one of those.

The reason I am against twins is the double whammy price for everything.
2-turbos
2-oil feed lines
2-oil drains
2-exhuast setups
2-charge pipes

A t70 will flow enough for 600 rear wheel horsepower and 700lb fts....easy.