I have had both, my 340 ran good but my 360 is faster. It should be though it has better everything in it.

My car was an original 340 car and that is stated on the hood plates. I often get asked what size motor and when I say 360 I get an odd look sometimes followed by "them 340s sure did run" I usually agree or depending on the person I will say yeah, but a 360 is bigger lol.

As far as the cast vs forges crank argument. Its well known that forged is better and I won't and can't argue thats it not. However I have broken a 340 crankshaft and my 360 crank was still alive when the thrust got eaten.

The 360 brings the cheap though no doubt. Mine wiped the thrust out 9 days before drag week this year. I bought a machined crankshaft and bearings kit from O'rielly auto for $188, and had it in less than 24 hours. It made the drive and is still together sofar lol.