3.8 is 60 degree, v8 and straight 6 and 305 v6 are 90- degree,
700r4 is same length as th350 if are both 4x4 and if the th350 is longtail 2wd
short tail 2wd th350 is 3" shorter than 700r4 just like thm200c and thm2004r and etc,.
also theres a 12" tail th350 found in mid late 70s wagons,
th350 longtail 2wd 9" tail is 31 11/16" overall and shorttail 2wd th50 is 3" shorter and 700r4 is same length as the 31 11/16" one
give or take a 1/16" or so on any of them