Changing out an older 340 motor to a newer fuel injected 318

Down to basics.
Exhaust will work,use Magnum exhaust gaskets. LA gaskets, blocked the bottom of the ports on mine. Headers being run? Should be mocked up ,on a engine stand. Might be clearance problems with the truck engine mount bosses.
Fuel pump/front cover: Hughes sells the adapter,for a mechanical fuel pump.The LA front cover& oil pan do fit. On a Magnum 5.2,not sure if 5.2 or 5.9pan fits. Rusty built one,maybe he will chime in.
Flexplate: A stock flexplate usually works,with one bolt hole elongated. dont know what thansmission you have. IIRC,5.2 Magnums are internally balanced,like a 318 or steel crank 340. If you have a cast crank 340 converter(weighted?),I would save it.Get a standard balance converter.
Www .Magnumswap.com,has some good info.Sorry about the post length....