i ran this Lt1 383 stroker motor in a different car 2 years ago and with street tires, came up with a best of 12.59 @ 113mph w/ 2.0 60' time.
after that, the car was in an accident and i built a new car using the same motor..

EXCEPT...

the wimpy cc 07-503-8 cam was tossed for a new GM847 cam, the mildly ported stock heads were replaced w/ fully ported heads, much beefier crane springs crane kit #10308, and manley race-flo valves 2.0 & 1.56s. the heads were shaved .010" to bump my compression to 12:1. I run 93 octane regularly... (please don't turn this into a discussion about reasonable compression levels for pump gas b/c the car runs great). As far as the engine goes that's pretty much all that i changed.
The rest of the car is set up about the same as well except that now i have a 12 bolt w/ ET streets (hopefully worth about .4 to .5 of a second right there) (gears are same 4.10's like my 10 bolt)
I also picked up some 8 mm plug wires an msd blaster coil and some suspension upgrades (polygraphite kit from PST, LCA relo. brackets, and tubular rear end parts)

My main question here is: how much HP do you think the upgrades are good for?

i drove the car last year but didn't make it to the track b/c i need a re-tune. In fact i blew the head gaskets last summer when i raced someone on the street. (probably a bad idea having not been tuned after the new mods) so i babied it around town mostly. The engine seemed a LOT more powerful than it did prior to the new heads and cam though! The difference almost feels equivalent of when i went from the 350 to the 1st 383.. wow! I'm hoping i picked up around 50hp.. and in the mid to high 11's but who knows. I'll be at speed inc. this spring and the dyno will reveal the truth.

as for any concerns: I'm a bit worried that the nearly stock fuel setup has to go now! I do have 30lb injectors but i think they're probably about maxing out on their duty cycle and i should upgrade to 36#ers. i also wanna get a adj. FPR, a 255lph fuel pump and a upgraded drive shaft. After thati'll feel safer about taking it to the strip.

discuss.
thanks