[b-man]

For a heavy at like a full-weight ‘69 GTO I’d be looking at a more robust 4L80E rather than the somewhat questionable 200-4R.

You’re asking a lot to run low-11s in a street driven car like that. We’re talking 3900 pounds without the driver.

If I was doing something like this I’d be running an aftermarket block with 500+ inches and a 260 degree cam to make a solid 600 horsepower without having to over stress the factory block with high rpms. Cubic inches are your friend especially on the street, those additional cubes will soak up a long duration cam and make it easier to drive.

Your 474 needs a bigger cam and a converter that stalls high enough to take advantage of it.

When you already bought most of the parts it’s hard to recommend just a cam that’ll get you there that you also already bought.

If you’re more into street driving than hitting the track to get a few time slips I’d really think hard before going automatic. Being a stick shift guy you might regret going to a high stall automatic trans, it won’t have the same fun factor as a stick. There are nice overdrive 5-speeds out there that might be worth considering.