Sbc 350 tbi heads bigger cam and broken valve springs

I bought a 74 sbc 350 with a rv cam and 305 heads. Immediatly i pulled heads off and put rebuilt 350 tbi heads with ss valves on. I think cam is a comp cam 262 duration. Went to the store and broke a valve spring. ( inner spring) cam is damaged and i need to replace all lifters and install new cam. What springs should i use? Im going with comp 268 cam. I just dont want to keep redoing everything over and over. Im new to this long time dream of having a hot rod. Just want to be right the first time. Mistakes cost money....

PBM has some real good products, mabye a spring with like 110 lbs seat pressure would he good. There's a company in Indiana that I order parts from, real good honest people and they care about the product the sale you. It's motorsports unlimited. 1-812-232-4282 . Ask for lance, tell him your problem and he will be more than glad to work with you..