Hey guys, i have some #882 heads on my truck now, which i am hearing are very restrictive. i found a set of 336 heads off a 71? The heads on myne were rated for something like 210 horse, and the 336 were like 350 horse. The 336 heads have been ported and polished, but not recently, they came off a monte carlo, that had a 350 supposedly built for the strip. One of the rocker arms in the head is broken. Is there any difference in valve springs and rocker arms between my current 882 heads and the 336? How are the 336 in general? would it be a good upgrade over my 882s? I can get the heads for like 50 bucks.