HP increase?
 

I've made a few mods from my old combo after I spun a rod bearing. Turns out the crank was in bad shape and ate up the bearings pretty quick. After a complete rebuild, I've upgraded a few things.

My last Dyno run gave me 325 hp@4000 rpm and 385 rwtq.
The combo was a 351w +.060, afr 185's, custom grind cam, gt40 tubular intake, 65 mm tb, 1 3/4 lt headers, and 73 mm maf. This was at 12* timing and running 87 octane gas.

Upgrade mods include a trick flow 351r intake (1500-6500 rpm), BBK 75 mm tb/spacer, and a bump in timing to 18* and 93 octane gas.

I know I still need to upgrade the MAF to an 80mm and i need to go with a fatter cai, but with the mods done, how much of a hp gain do you think I'm looking at?

Re: HP increase?
 

I would think you'd pick up 15rwhp getting rid of the GT-40 intake and opting for the 75mm T/B. I'd expect your peak power to jump up some rpm too.

Re: HP increase?
 

Your peak power will increase with the bigger intake but your torque curve will suffer a little bit.