Lots of things but I will start with this...  have you read this thread?

http://fepower.net/simplemachinesforum/index.php?topic=227.0  ...I've been where you currently are and trying to get.

I just read it, and I've seen one of your other postings, few around my area said if wanted to make bigger numbers go with c4s and then I read one of your threads on your build and that kinda sealed the deal on trading my d2s for the c4s, I find it rare to see many standard 390s making 500hp + and you seem to know what your doing for sure

3500 stall or better, quality converter will get you another .1 or even better.  No other changes.  If you reduced that quench to around .040 you'd pick up maybe 20 HP, without much change in compression.

What would be the best way to go about shorting the quench distance? As far as tge head gasket goes its .020 thick i dont know if i could get a .010 thick gasket that would actuelly hold out,, the pistons set .032 below deck i guess the only way would be a different pistons?

I just wanted to work the motor over a little more and hit atleast 12.9 1/4 mile naturally aspirated and id be more than happy.

 would a msd ignition and distributor  help out a little and adding cj valves to the heads??

Sorry for the long post there's just so much more money to hotrodding and racing than I ever thought haha. Anyway I pulled the engine out today to inspect after 3 passes at the track and around 100 street miles, last pass I threw the oil pump drive rod,  so far everything looks to be ok, but I'm using this as a excuse to build for a better track time as my last E.T was averaging around 13.02 ET 104mph.
So I was wanting to see if I could tweak anything of what I got to get a little quicker time
750ultra dp
performer rpm intake
10:2.1 SCR KB flattops 8cc
Quench .052 yikes!
Stock crank stock rods with arp bolts
Offbrand Electronic ignition Greybox
Bought pair of c4ae-g heads 2.03 1.55 valves 72cc chambers I wanna port them a little bit"
Non adjustable rockers, heavy duty shafts and end stands
Comp 290lb springs
Crower 290/302. 238/248. 550/557. 108lsa 80 deg overlap 69 ABDC 7:86.1DCR pump gas 2700-6500
C6 with transbrake 3000 rpm converter.
I was considering changing my 4.11 to 4.56s but not sure of how much quicker that would make me, first time I started paying attention to numbers I'm hoping for 420-430hp after some parts tweaking  and should put me into the high 12s which is what my goal is. So would anybody have any ideas as what maybe I could tweak with..

Awesome truck, I love seeing these heavy iron headed Fe builds scream from some classic home grown port work,

Hey guys ive port matched my heads on my engine but prolly wasn't that good as it was my first time. But I was curious to learn. Ive heard people say don't touch floor then some say do touch the floor. Some say leave smooth and shiny others rough and course for fuel atomization. Do exhaust or leave exhaust.. So guess im asking if I went and picked up a set of fresh c4ae heads to replace my d2s what would be the best at home port job to do for a begginer, thanks for yalls help

i havent ran it at the track yet, but around town so far its been a blast