new here and to the mopar world

Hi my names dave I just bought my first mopar.I've been a gm guy been there done that with them all and I always loved mopar.so I went a picked up a fairly ok 73 plymouth duster it has a 318 with the 737 auto.if you have any advice for set ups I'm all ears I'd like to go with a 340 4 speed.once I get some pics together ill post some.