my new 360...

just picked up a 83 360 2 barrel out of an early 70's motorhome in perfect running order.i think it's a rebuilt because the block is an 83.i want to swap out the intake with a 69 340 intake that i have laying around.a few questions:1 it has 2 different heads,1 j head and the other has no visible marking on the outside(squares where marking should be) are they compatible?.2 my 340 intake has a much smaller bypass hose than the original intake,whats the best way to fix? don't plan to open up the motor anymore than the intake.3 will this motor work ok in my 69 valiant with the 4 barell intake? just kinda curious at this point,running on a tight budjet and am happy to have a running 360. any input would b appreciated thanks.