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Finally got the block painted & some stuff bolted on!!! Going to paint all the accessory brackets red; going with a HEI distributor-the old one is just filling the hole. Also, in the last pic, notice the hole in the center of the head that the intake doesn't cover? WTF is it for & why does my weiand intake not appear to fit with it?
The good news is since you have Tim's pistons, your compression is up where it should be and a new cam, even a mild one will get you over (potentially) 300HP. You are certainly not intake limited with the new (Chinese) Weiand, and the 670 Holley should be good enough for anything up to 400HP or so if properly jetted.
I really think if someone wanted to do a SERIOUS porting job on a set of M heads, you could use them on a 500HP build, but that's a lot of time with a die grinder when aluminum heads are available!