I'll try and keep this simple. I have a 1990 roller block. Vortec heads. I built the engine with an edelbrock TBI hydraulic cam. I THINK I used the TBI cam valve springs. Well, I'm getting rid of the TBI cam and I'm going to put a "regular" roller cam into the engine. The purpose of this engine is reliability, dependability, efficiency - not maximum effort. So my question: Can I run the still new TBI valve springs with a basic, not aggressive roller cam, or do I need to replace my springs with the cams recommended springs. AN EXAMPLE: I'm looking at the Comp Cams XR258HR which recommends a spring of 981-16 I have no idea of what the TBI camshaft springs are/were - apparently this is obsolete stuff now. I'm trying to keep the cam simple because - again, I want dependability, and I don't want to pull my heads off and machine them. Oh, and the other stupid question... I have a double roller timing chain, which was matched to the cam. Can you run the same chain (sprocket) on a roller cam - or is that different/specific too?