904 converter question

I have a built, 904 in my 66 wagon...I have a warm'd over 318 now, but fix'in to swap back to tha 360 that I had in it a few yeerz back...The converter wuz built by a fren that builds converters, and loosen'd up my converter so the 360 will idle good(approx 1800-2000 stall)...I knocked off the weight when I put in tha 318, aand it work'd fine...OK, beins My buddy iz no longer around, I need to know if I kan use any weight off anuther Torque converter out ov anuther external balanced engine????.....Also, I would like to put an Overdrive tranny behind tha 360 for gas milage...Iz there a tranny that haz a non computer OD that I kan use with tha 360???...Keep in mind I need a loose converter for tha mota to idle, and it haz to be a small tranny, I don't want to have to make tha tunnel any bigger....

my knowlege ov transmissions ceased back in tha 70's...Lol