Not really - would require rework of exhaust and with the wider Vee on the 500/560, may require engine wall modification to allow exhaust manifold/downpipes through.
560 would mean complete rewiring....only a pre 86 500 is a more straightforward possibility.
Not worth changing to a 500 or 560 - 380's with a 3.27 diff are faster than a 500...the 380 transmission has 1st gear start from the factory (420/500/560 start in 2nd). That plus a 3.27 dff will make it mighty quik with the 380 power.