There is a gentleman making new lifter blocks. I have purchased a set and the quaity is excellent. The price is a Steal @ 4 for $200 , the same part from HD is approx $100 for one so that is half price. I do want to point that the relieve for the roller is cut higher for high lift cams. He does say that in his description. He is also making pushrod tubes @ $80 A set. I have not seen these in person. I had these made by someone else 6 months ago for myself and I think his price is very reasonable.
His name his Dave, here is his email.
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it