I've had 2 of these manifolds crack on the number one & two cylinder runner, across the water channel on the bottom. On the A15 in my Sunny wagon there's a brace from the top engine bracket bolt on the block to the inlet manifold. This is probably what I needed for these manifolds. A piece of round steel tubing with the ends flattened & holes drilled would probably do the job. Get it anadised & it'd look factory. As for the cam choice, I used the factory 70 degree grind, and the cam was good with the injection. My problem was I never used a throttle position sensor with the computer. So it was running off manifold vaccum only, not the best idea. Today I'd probably try the AC Delco idea, as I have a friend who loves those things.