Re: Trans Question
Here's what I found out when building my 69 with 454. Street build, no racing, just some feel good experiences every now and then.
I too had a car with a Saginaw. The Saginaw was built by GM for 6 cylinder an small V-8 cars. Needless to say, not advised for a big block, and resale value with a Muncie makes it correct.
Find a good Muncie 4-speed 10 spline input 27 spline output and use that.
If I had to do it all over again I'd gow with a newly rebuilt Muncie rather than finding one, getting it built, etc. M-20 for 3:31 gear and down, M-21 for 3:55 up.
Several guys on here can recommend where to buy one completely rebuilt.