What you have then is the integral head. The integral head is not thought of to highly, though there is a rumor that there are folks who have got good performance out of them. Sounds like your looking for better performance. I would suggest an earlier head (194,230,250, 292) it would bolt on.
Larry
68 C20 327 daily driver
63 C20 292 Camper truck
65 C10 ? Custom Cab AC,PB,PS,$flasher
