If the heads are original to the block, and are the later "double hump" heads, they should be casting #186, and have accessory bolt holes, etc. The early "double hump" heads did not have accessory bolt holes, the most common casting numbers being 291, 462 or 461. I'm certain that by the 1969 model year they had accessory bolt holes in the heads, not sure exactly when they made that switch, but 1967 engines still used the heads without the bolt holes.....Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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