Thanks to all for the responses, I do appreciate it.
Just to give perspective, I've been in a 10.0x second car, and briefly driven an 11.4xsec car and 10.6xsec car on the street (buddies let me drive). I have a basically stock 2013 Mustang GT and a 2001 Lightning that made 412hp at the wheels and should run 12s as well, I ran 13.02 in my old '93 Lightning with Powerdyne. Not saying any of that to say I "know it all", just perspective that I understand what a 12sec car should feel like.
To be clear, I don't think the Marauder is a 12sec car now, and I understand 12s are a stretch for it.
I am running 3/8" fuel line, no return (originally wanted simplicity). My guess is that the fact that the pump can run returnless means it may be suspect as far as performance. Filter is just a cheapie plastic inline. I'll get a pressure gauge on it whenever weather breaks and see how it's doing on the topend. I feel like it pulls ok in 1st/2nd then lays over in 3rd or 4th, which leads me to think it's emptying the bowls, possibly, by the time I hit third. Car feels nice and torquey, responsive in midrange but goes flat after say 4500. Springs could be concern too, but doesn't account for it pulling well in lower gears.
I run a Centerforce Dual Friction clutch.
Trans is a close ratio, as I believe all galaxie T10s are, something like a 2.20 first gear. As said, it's lazy in first. I wanted to avoid slicks due to the T10, plus to be honest it's so lazy in first I don't think they're really needed with current 3.50 rear.
I fully intend to put a 4.11 center section together at some point, but I want to go 31spl at the same time and with other "to do" stuff as priority, can't swing the cash at the moment. Car wheel hops badly so some type of traction bar are first up. I have an aluminum driveshaft ready to go in, but won't put it in until I have the bars.
Distributor is an MSD Billet, have it setup right now with 15* initial timing, 37* total....meaning it advances 22*.
Jrpumper, the FE reunion is being held at Beaver Springs Raceway in PA, 4/26/2014.
I'll get some data and report back, like I said I can get it dyno'd. Curiosity is there because some guys have similar combos and have run low 13s or 12s, and some cars with strokers and gear run in the 13s. Trying to optimize what I have, but still with understanding it is a street car.