Block huggers are the only headers you will find that will fit without making a set yourself I bet....
Even some of the more compact headers won't fit on an Interceptor, the floor at the front is in the way. Hedman (I think) makes a header that looks close, but I have never tried them so I'm guessing they wouldn't fit if I had to guess.....

I think alot of people think the Interceptors are over 4000 pounds, but I think even the MIII Interceptors are just shy of 4000 pounds..?

An HONEST 9 to 1 compression is pretty good IMO.

Any pics??!?!