I wouldn't run a thmpr in that engine. I'd go with something more along the lines of the big extreme energy HR cam or something like that if you want an hydraulic roller engine.
XR-286-HR
XR-292-HR
Make sure the springs that come on the head are suitable. Look at pep boys for a 25% off coupon code then have summit match it if you want to buy from them or buying a bunch of stuff at once.
Run an ede air gap or a victor 340 with a 1" spacer. The action plus is not a good choice IMO. I'm not a fan of the m1 intakes.
The 750 will work if you have it, it will likely will want more carb.
Don't spend money on titanium retainers. A good steel retainer is fine and preferably a 10*