i respectfully disagree on what you said about the reliability of 331's and 347's. the 347 "may" have oil buring problems eventually 100,000 miles+, but i have never heard of anyone claiming that. the companies just tried to make tons of money on the 331 when it first came out, and they did just that by putting down the 347. people say that the rod angle on a 347 is too much...thats false also, look at the ls1 GM motor, the rod angle in that thing is far worse than a 347, and yet it is reliable enough to put in a production car (with a warranty) if you go with a "well built" 331 your motor will be just as reliable as it was the day it rolled off the show room floor.
yes the gt40p's are cast iron, they will give you more performance and wont break the bank.
you could either stroke the block you have now, or just buy a whole short block from somewhere. (they all use the same block that you have now...a production block)
get a 331 or 347 you will thank me later, and you will have the same driveability that you have now.
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