Not a lot of reason to guess on horsepower. Get the engine in the truck and take it to someone and put it on their chassis dyno, tune it and maximize the horsepower. Last week we spent $135 for 5 pulls on the chassis dyno. Tuned and tweaked the stock bore, aluminum head 460 to 500 horse, 500 torque. The dyno time was the best money spent on the car. It would take 10 or 15 passes at the dragstrip to get the tuneup this close.....

Be realistic with your 350 expectations is the best advice here. Big cubes with low rpm and hi torque is the key to street performance on a budget....