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To repeat what's been said already: The 360 is balanced at the front and back. It has a special thicker balancer up front and YES it has be balanced at the rear. The B&M balanced flexplate is by far the cheapest and easiest hassle free way to solve the problem. You will be very happy with a 360...
More cubes are always better. The 360 has a longer stroke, making it a much more "torquey" engine which is great on the street. Here's the 318/360 interchange problems you will have: They are small, but if you don't know about them, it's a PITA (first letter "pain)
The 360 uses a different oil...
It's an easy swap. I have done that swap in a 65.
The newer 318 will bolt to your poly's transmission (one bolt is different and is left out) and your poly's motor mounts will work on the LA motor. If you decide NOT to use the poly trans, the other 727 will go in on the same mounts and linkage...
The 72-74 w-100 DID have 5.5 pattern. I just pulled apart a 72. Also, 15 years ago a friend switched his 85 to 8 3/4 with a 72 w-100 axle. BTW, the 72-74 TWO wheel drives still had 4.5 BP
I have the rare 72-74 W-100 8 3/4 housing & axles with 5.5 inch bolt pattern!
It's a bolt in swap on the 85-93 truck!
http://www.ebay.com/itm/230791919009?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1558.l2649
I'm bidding on a 62 or 63 parts car that will probably have it. If so, I'll be bringing the parts to Carlisle and the Nats. I don't know what your time frame is.
Greg Purcell
I have the axles and housing on Ebay. The axles are good but the bearings and possibly the retainers need replaced. I can sell you just the axles for $50 plus the shipping if you'd like...
Fair retail on a complete (used) A body 8 3/4 setup with good brake drums ranges from $350 to $600 depending on condition. Sure grip will add up to $300 more. I haven't seen ANY used A body 8 3/4s for $150. Even a good A body 8 1/4 (one quarter) can bring $200 these days. Now, (since this is a B...