89 L98 TPI. want to upgrade heads . i have a set of big 76cc 202-160 heads from old 350 motor 75-78. other than center bolt issues am i looking at any problems?? P.S. mortec says my 89 heads suck. plan on a little cam upgrade.

 

With that huge chamber size these heads won't be an upgrade, you'll lose compression in a big way.

Check the accessory holes on the fronts/rears of the old heads to see if they're in the same location as your current heads. When I bought GMPP aluminum heads, I had to have the shop add a hole for the serpentine accessory brackets on each side.