yet another power guess.
 

Holley 4160 vaccume carb no choke. #64 jets
performer 289 intake ported to heads with gasket.
Windsor sr. heads. 2.02 1.90 valves. 64 cc chambers
magnium series comp cams roller tip rockers.
comp cams xe262h cam.
hooker super comp. short flowmaster exhause.
msd dist.
stock bottom end
c4 trans with shift kit
3.55 gears.

hp and tq numbers please.
also what compression do you think im running?
154 psi per cylinder.
should i leave the stock timing curve or upgrade?

what should i mod next ?

kinda boring but im looking for direction.

need alot more info about engine

154 psi dont mean nothing.
You can have anywhere from 8.5-11.0 to compression!!!! if not more or less.
Cam shaft, intake track, hot, cold, proper way and inproper way can really change the results if not a whole bunch of other reasons.
We need piston size, stroke, head gasket thickness, etc, etc

What type of rear end is it? 9 or 8 inch, posi or not? Are you going to run slicks or not? You will need traction bars. subframe connectors. Who built your engine ?
Be patient and read a lot of articles in the mustang magazines and you will be surprised at all the info you can gather. Are you in a mustang club, cause the people in the clubs are a wealth of info.
Good Luck,,,,,It took me 7 years to complete mine just to get it on the road and i'm still never quite done with it!

i dont really care about quarter mile times right now just hp and tq numbers. but anyway its a open 8. used to be posi but i broke the gears from running it to hard.

the block is stock with 4 valve reliefs on the pistons.
block bored 30 over and stock head gasket. dont know the thickness. i think your other questions is in my first post.

thanks