Machinist will not build engine unless roller cam is used!

I have been using Trend 513 tool steel SFT's, and pushrods. in comparison they have a huge radius , weigh like 65 grams as compared to 125/130. I don't need heavy springs any longer. I also use Ti. intake valves basically same weight as exh. ss. But i back out at 6300. 512/400. I know this post is about rollers though. This will be my 3rd. engine, same lifters but spendy.