i already have a set and their off of a 350. but today i bought a set of bare 194's new in the box for 25 bucks. but my friend said their for a 305. then he told me to use the 305's with 350 valves. i plan on just swapping the valves and springs off the heads i have now. will i have any problems? and how do i get the valves and springs out anyways? i bought a spring compressor and compressed a spring and im still confused only 20 bucks poorer.