The bellhousing has 10 trans. mount bolt holes, std. GM being one.

I'll send a px when snow melts? Casting # 3947709, with GM 4 under it, this casting number is located where the trans mounts, so, could not see it if trans is attached, may appear elsewhere.

For long input shaft no 9+ inch(short) input. May also be attached to GMC V6 without the adapter plate, so look there too. 5.125" retainer dia.

None of this is SAE compliant. I have nothing but bellhousing plus adapter plate like your px. So you will need flywheel and its starter.

Ed

Last edited by EdPruss; 02/05/2016 6:35 PM.
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.