440 tunnel ram

If you choose to just put a timing chain set on I would buy a decent set as it can stay with the engine as you improve it. I would replace it and BEFORE reassembling the motor do a compression test on it. I suspect that it will fail with either the heads or rings or both needing work. I just don't see the need to make more power with a motor that's wore out.. but a new timing set will at least give you an accurate compression test.