Easiest way to i.d. the 250 series block is the spin-on oil filter mount, just ahead of the distributor. If it's a 230/250, the fuel pump is aft of the distributor, followed by the motor mount. If it's a 292 the motor mount is between the fuel pump and distributor. The casting number you need is just aft of the passenger side motor mount (250) or fuel pump (292), should have a large GM below it.
If it's a 235 series the casting number is either above or behind the starter.
Tranny id. Is it a 3 speed or 4 speed? Makes a difference.
Best way to determine the clutch is to compare to what you have, if you have the old clutch. Otherwise, do the bolt holes align with the flywheel, and does the disc fit on the tranny shaft?
