Magnum swap plan
May want to rethink using the '69 thin cast iron water pump, possibly going with the later aluminum better flowing water pumps.
Along with this comes a radiator with passenger side lower exit, later timing cover with timing marks on the driver's side so you can see them.
Realignment of the belt v-belt pullies.
Does the magnum cam have the long nose snout to mount the manual fuel pump eccentric to, or do you need an aftermarket eccentric cam adapter? (Being Magnums had electric in the tank fuel pumps)
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Added thought:
Hang onto that '69 318, 9.2:1 cr, 230 hp engine. With the flat top pistons only .040 ths. in the hole, and light free floating rods.
The more sought after 318 engine vs the later smog era lower compression engines.
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