from experience but from personal experience i can make a few comments.

if the intakes interchange, and i think they may, and if your 450 is in good operating condition, then swapping all the engine fuel and electrical parts over to the 560 engine sounds like a good plan. i have no personal knowledge if this is possible or not. if you could do that it would solve all sorts of interface problems with engine/chassis wiring harness issues, etc.

the exhaust surely could be used from the 560.

i dont think that you woiuld have to worry about mixture etc. the fuel system i beleive senses air flow and would provide the proper mixture regardless of the size of the engine pulling air through it. the size of the intake on the 450 system may simply limit the 560 to the power of the 450 or similar.

just a few thoughts.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.