Coil arcing problem

[Blackbug]

Just picked up my interstate 'sight unseen' 71 superbug and it's running like @#@&% with no pwer under load . I noticed that the coil was arcing from the body of it to the lead that goes to the distributor .its a hec 715 coil . Thinking that was the problem I replaced that but it's now worse.next thing is the leads!!??
Has any one come across this problem .
The engine has some work done to it and is running twin 40 's and should have some good power behind it !!

[h100vw]

Leads are as likely a problem as the coil itself. make sure the coil is bone dry and free from anything that could conduct. Clean with brake cleaner or something like that.

On a points system, I'd just do a set of leads anyway. Having had Minis run on 3 cylinders with a whiff of moisture in the air, it just makes sense