need advice on a ford mustang.?

hey i have a 1990 ford mustang. i had the motor rebuilt it was bored thirty over and i had a little head work done and added a E 303 cam. the motor is really tight and at first the starter would not turn the motor over. i replaced the starter and the battery which solved the problem. but now i can set the timing but a couple of miles later its like the timing has not been set and the motor stalls out and shuts off. and the kicker is it will not crank back up until the car cools off. i have checked everything twice but im still stumped. any ideas?
 
Sounds like the pistons outgrew the cylinders. The first start on a fresh engine is always hard- very hard. You let the engine idle and circulate oil and do not rev the engine while it runs in, about- I'd say a half hour. You did use assembly lube on the bearings as you put the motor together didn't you? Loosen and re-torque the con-rod bearings to make certain none of them are too tight. Let the engine run at idle until it will run smoothly, before you try to drive the car. Wait til tomorrow when the engine is stone-cold.
 
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