I concur with Jack. If you want to do it yourself buy a kit from a reputable and experienced Ford high performance vendor. If you want a turnkey engine, stay with shop that specializes in Ford high performance builds and take their recommendations. A friend of mine had a local performance shop (I won�t name them) build him a 347 for is resto-mod �65 Mustang. After spending 5+ grand with a predominately Chevy shop, the engine has never been right. He has taken the engine back several times, each time the �fix� has introduced additional problems. The last time, we got a dyno sheet that was for a date that they did not have the engine.
The CHP 377 I used was balance, had a steel crank and required minimal bloc clearance work. As I recall there were only two places and the material removed was less than a quarter inch.
Good Luck
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