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Since you have it apart, have you thought about upgrading to vortec heads and manifold? 25~35 more HP and everything bolts right to the shortblock. You will need the vortec manifold but looks like you are going to have to buy a replacement anyway. You can find a good set of used heads on ebay for ~$250 and pickup a stock manifold w/ tbi pretty cheap too! These came on 1,000s of chevy trucks over the years and can be identified by the vertical manifold bolting and only 8 bolts. Later predators were rated at 310hp. I suspect the cam and internals are the same as yours.
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