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I'm making plans to start work on my '71 Demon and have a few questions.

1) I'm going to swap the original /6 Auto for a 408 stroker and auto. What are the advantages/disadvantages of swapping the K-member out vs. using engine swap mounts? I know of a V8 K-member from a '74 Dart that I can probably get pretty cheap.

2) What is the best engine wiring harness for this swap - original or repop?

3) I'm assuming I'll need to upgrade the stock radiator. What should I look for? I don't want to go aluminum - I want the engine bay looking close to what the factory would have done.

4) I also plan to swap in disc brakes from a '74 dart. The demon has manual brakes. Will I need to also convert to power brakes or will manual discs be OK?

5) I plan to relocate the rear springs and do a mini-tub. Would an early B 8 3/4 housing be a good option for the rear without narrowing? What size wheel and backspacing should work? (yes I'll measure before ordering anything)

Thanks in advance.

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Quote:

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I'm making plans to start work on my '71 Demon and have a few questions.

1) I'm going to swap the original /6 Auto for a 408 stroker and auto. What are the advantages/disadvantages of swapping the K-member out vs. using engine swap mounts? I know of a V8 K-member from a '74 Dart that I can probably get pretty cheap.

2) What is the best engine wiring harness for this swap - original or repop?

3) I'm assuming I'll need to upgrade the stock radiator. What should I look for? I don't want to go aluminum - I want the engine bay looking close to what the factory would have done.

4) I also plan to swap in disc brakes from a '74 dart. The demon has manual brakes. Will I need to also convert to power brakes or will manual discs be OK?

5) I plan to relocate the rear springs and do a mini-tub. Would an early B 8 3/4 housing be a good option for the rear without narrowing? What size wheel and backspacing should work? (yes I'll measure before ordering anything)

Thanks in advance.

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the 74 K frame uses spool mounts which are fail proof, and also uses the better sway bar design. Good upgrade. And Shumacher has repro mounts with poly inserts too.
The slant six harness can be reused, by shortening the coil wire or buy a repro harness for a small block.
I prefer manual brakes and manual discs on an A body work well
The rear track on A bodies never got wider and on Demons and Dusters, it loks too narrow. A B body 8 3/4 fits nice and makes the track width look better plus the added benefit of big bolt pattern to match you 74 discs up front. . Unless you plan on running deep,super wide back rims and then an A body 8 3/4 with aftermarket big bolt pattern axles will let you run wide rims, like 15x10's for that 70's look.

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