i'm building a pretty hot 350 for my 1960 chevy truck. it's about 11.5:1 compression, solid roller cam, ported aluminum heads, etc......i'm looking for quick revs and upper rpm horsepower ASAP so my whole rotating assembly is the ultra lightweight eagle with mahle pistons and 6.125" rods, etc....i'm looking at ATI Super Dampers and i need help decided whether it's worth it or not to spend an extra $75 to get the light weight aluminum ring as opposed to the all steel damper. This is just a "street" truck but i do have very steep gears and a 4 speed and this engine should make power to 7000 rpm. i would like to know if it's worth the extra money, how much this will benefit quick rpms, less stress on the the engine? i would like to know anything at all about these two dampers. pros and cons of going either way.

also, on another note, i've been thinking about getting my heads angle milled. i've talked to a lot of circle track guys that say go on ahead and do it. i understand that the more the valve angle is stood up, the more power produced. But on my "street" motor, would it be worth it? i can deal with the higher compression but is the airflow really worth all the work? my heads are already ported...

thanks