[520SC]

The cylinder heads are "off the shelf" Edelbrock heads, not ported, just gasket-matched.

I told ATK that I really wanted to maintain 12-14 inches-Hg to run the power brakes. Given that limitation, the most aggressive cam they could recommend was the 225/235 @ .050" with a 112 degree LSA. Installing an electric vacuum pump would have worked, but I didn't want to bother with that. We also discussed the use of a hydraulic roller cam, but concluded that the additional cost associated with a roller cam couldn't be justified because of my self-imposed engine vacuum limit, which was going to severely limit the cam duration. So, I agreed to use the 225/235 hydraulic flat tappet cam, which is just a bit more aggressive than the Comp Cams 218/218 in the old engine.

I did a couple of full throttle pulls up to 4500 rpm in 2nd gear yesterday. So far, so good. The engine seems to pull hard.