1968 Barracuda / Hellcat Redeye swap project
If I was doing that swap I would use an aftermarket k-frame. I don't believe a factory k-frame and torsion bars can handle it. We did a 5.7 and a 6.1 swap with a kenne-bell and even did a Gen II Hemi and all three used aftermarket k-frames. I think you are in for a world of hurt if you stay with factory parts...
Not sure why torsion bars can't handle it. The OEM k-frame (in my opinion) should be welded and gusseted, but after that don't see why it can't handle it either. And really not sure the gusseting and such on the factory k-frame is absolutely necessary, I just don't like the steering box flex I am seeing in mine.
Current options for using the new Holley mounts for an A-Body is OEM spool mount k-frame only, far as I know. So that path kind of forces an OEM k-frame.
I agree that losing the torsion bars clears up some room for headers, but there are options for TB cars so it's not like it is impossible.
I know the oil filter is an issue with the OEM k-frames though. the Holley system moves the motor forward about 1.75" and with the 90 degree adapter it clears without issues (already mocked mine up to check). And I know people are using the QA1 k-frame with TB's and moving the PS motor mount back to make that better. I suspect that an OEM k-frame could have the same modification done. The other option is a slant 6 k-frame as the PS motor mount is in a different location and (I think) makes the oil filter issue better as well. Not sure the /6 to G3 mounts are available anymore though.
Another issue with the OEM k-frame is the AC compressor if you run a low mount car style setup. The Holley system works with the OEM k-frame provided you use the later VVT FEAD setup. Other than that, don't know of any options for a low mount AC compressor and an OEM k-frame beyond just rolling your own (been done once that I know of).
Power steering is another issue with the OEM k-frame. There are headers from TTI that are supposed to allow PS with the Borgeson box, and the Holley system works with the same box as well. So it's not impossible to have PS and a G3.
Add all the other arguments over the validity of full aftermarket front ends, and I don't see why the factory k-frame can't be an option.
But to each their own.
