I agree with most everything said above with these exceptions.
I’d lose that air gap so fast your head would spin. The TR heads will reward in spades IF you treat them like what they are, which is a performance cylinder head. They beg for lift. Give it to them. And the AG will choke them.
Use a solid roller. You can use hydraulic roller lobes but put solid rollers on them.
You really, really need a header with 1 7/8 inch primaries. TTI has them but I’m not a big fan of their collectors. There is another place back on the east coast making some nice headers that size but I can’t think of their name right now.
Don’t buy a “big” cam or a “small” cam, buy the RIGHT cam. The RIGHT cam will have short seat timing, get to .050 and .200 quicker than everything else in that duration rage and put all the lift to it you can. Realistically you should be able to NET .630 or more lift in an easy on the valve train set of lobes. You will be rewarded with a broader, flatter torque curve, smooth, clean drivability and better performance.
Before I ever bought a set of rockers I’d call Mike at B3 racing engines and ask him for his opinions on what rocker to use and then buy them from him with his correction kit. This step right here will save you time, money, grief and parts.
