Hot new heads make you want to beat on an engine
If the short block was marginal, you'll hasten its demise by beating on it (old heads or new).

If the short block was solid, it should live just fine.

My 75k mile OE short block is living fine at this point with a fresh set of ported Magnum heads, but I'm only around 3000 miles on the combo... you'll have to check back with me!

Scott B. "I'm a self-made man... I started with nothing, and I still have most of it!" 68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph 69 340 GTS stock 14.18@ 95.60 mph 01 5.9L Ram 1500 Quad Cab 4x4 01 3.5L 300M 16.23@ 86.97 mph