As it stands right now...I'm glad I did them but they were a pain to get installed. They are taller than 440Source, RMS, EZ-1 heads. So the already close blower motor is even more in the way (mine is still unbolted and resting on the valve cover). Also, the regular cut to fit pushrods sold my 440Source and Mancini for 440s are still a little short even without being cut. I ended up using the ones I got from Mancini without cutting them and made up the difference with my rockers. Finally, the rocker shaft hold down bolts are all the same length so the standard kits you buy that have 2 longer bolts for the 2nd in perches will be wrong. Talked to 440Soruce about it since I used their hold down kit and they said its a standard kit so they had my buy some allen headed bolts at the hardware store to replace the longer bolts in their kit.