How hard would this be and would it offset the balance?

All things are possible if you have the money for it. A good suspension set up can at times compensate for unbalanced weight distribution.

the engine bay is too small to fit it traditionally. If you have the time and money, you could move the dash and firewall, and mount the engine at an angle, and get a custom hood to account for the bulge. Better option: supercharge the engine, and upgrade the rear axle and diff.