I your going to really start cutting on your GTX
Ladder bars or 4 link if it's going to be a dedicated racecar,
if you have to stay within the NDRA specific rules possibly...
if you can't really do, albeit more work, more cutting
what I'd actually suggest
would be a rear back half the car,
add a cell & trunk mounted batteries, fuel system etc.
narrowed rear end, Dana-60 & spool 35+spline axles
Mini tubs or better yet, real full tubs
with larger wider rims & tires {not sure the rules for NEDRA}
But a 4 link & coil overs, would be the best & infinitely adjustable...
if money wasn't a concern & you really want to go fast
& have the adjust-abilities of a Professional race car,
for about the same costs as the Ladder Bars...
{unless maybe if you have somebody, that already has a rear end already set-up for Ladders}
What they are & how they work & why a specific suspension
http://www.cachassisworks.com/stories/techcac-003_web.pdf
Chris Alston Chassisworks products & kits examples
http://www.cachassisworks.com/c-193-suspension-rear-drag-race.aspx
Strange Engineering
http://www.strangeengineering.net/dragrace.html
CalTracs are a literal
bolt on like I said before,
"they very work well at your power levels & ET's/MPH's {even much faster}
especially with the correct settings, shocks & mono leafs
http://www.calvertracing.com/index.php
enter you car
when you start making allot more power,then the afore mentioned 4 link,
that's what most "all Hi-HP dedicated racecars" all strive to have the best
But a Ladder Bar set-up will work very well too,
kind of depends on how much $$$ you are willing to actually spend,
how much work & how much effort/modifications/fabrication you actually plan on doing
That's my $0.06 cents now