Need a new Dizzy - What should i get?

[Billla]

If you're turning less than 5000 RPM, any working stock HEI is going to be fine and deliver just about exactly the same performance. Check for worn bearings and distributor end-play and just drop it in. Remember that it needs a new 12V ignition hot source - search is your friend for installation instructions on the board.

The higher-end aftermarket HEIs offer more tuneability (they typically come with centrifugal curve kits and an adjustable vacuum advance) and will deliver out to about 6200 RPM; 7000 RPM with CD add-ons. Having worked with a bunch of these from a performance/tuning perspective, IMHO the Accel stuff is all junk, and the MSD stuff is universally outstanding.