Upgrading to full-synthetics is always a good idea, so long as you can afford it.
10w30 would be just fine for your engine.
Now having said that, it's not a good idea to do performance mods on a motor with over a 100K miles on it. You'd be improving the power output of a motor that barely wants to make the power it was designed to make!
I'd recommend first doing a complete overhaul of the bottom end, then think about performance.
As for performance heads, the sky's the limit. As the old saying goes: How fast do you want to go?
Also, your choice will depend on if your engine is carbed, or injected.
If you keep your Edlebrock cam/intake/carb combo, then I'd suggest getting a pair of their heads. They'll perform as a system and you can't go wrong!
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Wednesday, January 13th, 2010 AT 9:33 AM