The 292 is the same length as the 250.
The water pump is slightly different because the 292 pumps more volumn. Many 292's have a three row pulley so the radiator will probably get moved forward. The 292 is 1.75'' taller. More torque in the 292 engine. It also has side (offset) mounts so you'll have to box in the frame area when mounting the engine. See Buffalo Steve in inliners 12 port ad.
cmc I think you mean the 292 is 19% lighter not shorter but I'm at work and Leo's book is @ home.
Check into a T5 or 700R4 for trannys. There are many rear ends that could work. A 10 or 12 bolt rear end 6 lug out of mid 70's chevys work well. Other 10 & 12 bolt rear ends may be 5 lugs so it depends on what you want to have. Some have H.D. brakes (2.75'' wide x 11 5/32'' round) as opposed to the std. brake shoes of 1.75''x 11'' round. Get the rear end mounting kit from Chevy Duty which comes from classis engineering in calif, It will just make the swap job easier.
Do your homework first and decide on what rear end gearing you will need w/ your new ?? tranny.
SEE:: for gearing, plug in various rear end types and transmissions as well as tires sizes to calculate the answers you need. Now you can go hunting.
http://www.smokemup.com/auto_math/index.php gooday
