Well Im running a 262H which is a 224/232 duration .500 lift and a stock PI has a .532 lift.... Im sure a cam that has 234/230 duration with .550/.500 lift will be ok.
The Hitech cam is a different design cam, it was made for the stock PI head. That is why its making more power than the other cams on a stock head.
Now if I was going to use the comp 270's or VT stage 2's, then hell yeah I would be installing high lift springs. But Im gonna buy the hitech's and run the factory springs.
Trust me for the cost of cams for mod motors, Ive done hours of research and seen probably every video on the web in the last couple weeks. I should be ordering them around the 1st week of April.
What happened to the good ole' 99.99 cams? lol Back in the late 80's early 90's I changed cams more often than spark plugs...