sorry but thats not a m113A2 its a m113 AS4 my job is to install that engine and gear box in the new M113's
Printable View
If you look on Mark's site you will see that the full works excluding mounts costs about $3.5K.
That includes modded GM ECU, extractors , flywheel , starter motor, adaptor loom.
To me it still looks possible.
The old RRC would be nice with 5.7 litres.
Regards Philip A