Long valves on W2's with .600 lift?

"We hope to have some low cost fun" Exactly what I was getting at, could the old 3/8 stuff be reused? I know its heavier, but does it have to be replaced? New rockers and valves,guides,retainers and all are gonna cost a chunk, maybe it's all crap but I thought it was fairly new, I may be wrong. Just want to see ya get out there and have some fun, your surely out Dollared, but you gotta do what ya gotta do! Always gotta root for the underdog, go get em Krooser!