The trans is a lot easier than you would think. tear into it. After that, get a book on the Th400. You will be amazed at what you can do.Would you mind grabbing some photos of the port/bowl work compared to stock? Once I get my 500 swap ironed out and build up some more funds, I'm looking to do a cam and head work later on. I'd also be interested in the particular combination of valve springs, retainers, rockers, and machine work to the valve spring seats/guides/etc. Also could you elaborate on what you needed to do to the trans to handle 1k hp? I've done a lot of wrenching over the years, but never played around inside a transmission before, always just swapped the whole thing when one would go out.
I'd port the stocker, but keep your eye out for a used Edelbrock. The amount of gains per $ spent on a new Edelbrock vs. a ported stock manifold is pretty low unless you are going over 5,000 rpms.
Did the Speedmaster rockers require the 0.050 longer pushrods?
Stock '75 is 1.173" on all lobesCan you tell me what the diameter of your cam base circle is? I bought a used cam and I think it is reduced base circle and I need to check. Or if you can tell me the base circle diameter of your stock cam, that would help too.
If you dont have the eldebrock intake you can port out the stocker.I used a 1968 or 9 intake that had the chanel to heat up the carb.I tapped threads in the holes ,plugged them and filled the channel with JB weld. Then I cut out the four holes till it looked like the eldebrock.Cut the center divider down a 1/2 inch and radiadus the lips going into the runners. I dont know if it's anywhere like the eldrebrock in performance but it runs really good with it ported. The engine is stock except the mts 15 cam,1.7 rockers and ported intake. I just got back from a test run and for the heck of it I stopped at the corner and layed down about 50-60 feet of rubber with my posi. I have pics somewhere that I can't find of the intake to show you,still looking. (And no I didn't think to try to record the smoke cloud )