is a 78 360 truck motor stll an la motor

is a 76 360 pick up still an la motor ? or a magnuim motor? says it has 107 kb pistons in it could it still be an la with closed chamber heads or is it the wrong motor to put in a dodge dart there any length differance or tranny mounting differance from a la 1968 dodge dart with a 727 automatic to put indy la heads on