Sorry but i'm not understanding the whole picture .
Maybe why you haven't got any responsed yet .

Transbrake is a valvebody and your launch is decided on launch chip .
Racers that go with a P/G are trying to take the low end out the cars launch .

I'm surprised you can't get 6000 or better out of Motor even with hydraulic cam but maybe not enough for a 408 for sure.
more gear would help .
good luck .
DR

2009 418" build dan smith built new 9.96 131.82 6.23 108 1.30 60 foot best to date 9/15/09 8in 727 430 dana 2860 lb 3040 lb w driver