Almost all of my heads exhaust studs needed to be helicoiled. And I think that was from a warped cast iron manifold. Well I thought I had a deal on the Thorley header but the price on line changed. I have to wait and see. Are Trail Gear headers any good? Prices are not so bad and a nice thick flange.
Make sure the brace between the exhaust and bell housing is intact. Eliminating that brace will eventually damage the threads in the head. When I installed my header I made a custom brace due to the factory one no longer being compatible. I also like to use a flex pipe to be safe.
80 shortbed-22re,w56,Marlin 23 spline dual cases,HighAngle drivelines,RUF/63"chevy's,35''mtr's,85 front axle,30 spline Longfields, Allpro highsteer.87 rear axle,5.29 gears,rear spool,BudBuilt cm, marlin HD clutch,ramsey 8000 winch.
Also 84 toy DD 22R 4.88s,33'' toyo mt'z, marlin clutch,4inch lift/63's, HA drivelines.