i have approx 2000 mi on a stock rebuild. I have resto modded my old jeep. So far I have replaced the original intake/exhaust manifolds with aluminum intake and matching exhaust from an '81 so I can go with a rebuilt MC2100 carb. I also got rid of the points and went HEI. Great so far! I would like to go with a header for a little more performance, the problem is I have an old Ramsey PTO set up with the shaft running from the transfer case to the winch. It runs along the frame rail. When I modded the exhaust manifold, I had a local shop hang larger pipe and muffler so she could breathe. Do you think I could fit an inside the frame rail type header in there? Would an offroad shop "test fit" one to see if it is possible before buying?