Driver's side front to rear: 1-3-5-7
Passenger side front to rear: 2-4-6-8
400 Turbo-hydromatic transmission. FYI: The 501 was not the c.i. of the motor. It was a designation for the Cadillac engine family, which included the 472 c.i. and 500 c.i. engine. If your car is the Eldorado then it is the 500 c.i. engine. Other than the Eldorado, you have the 472 c.i.
firewall 7 - 8 5 - 6 3 - 4 1 - 2 front of Cadillac V8
Yes
yes.
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1968 is when Cadillac introduced its new 472 cu inch 8 cylinder 525 ft lbs torque engine. In 1969 a larger 500 cu inch version was available. It was the only engine Cadillac offered from 1968 to 1972.
modifcation of the mounts is likely needed
a 472 c.i. v-8
It is not good for the engine if it is the original setup from the 1970's. Lead is needed for lubrication to the valves. A reconditioned engine can use unleaded fuel if the intake and exhaust valves and the seats are replaced.
To begin, the motor mounts will be different and for that reason alone, no, it will not fit exactly.
The 1968 Cadillac automobile was manufactured with a 472 CID V-8 engine. Some of the other original specifications for this car included a Turbo Hydra-Matic 3-speed automatic transmission and a fuel tank with a 26 gallon capacity.
Model year 1969, 472 CID: 5 Deg BTDC with vac adv plugged, rpm @ 550, a/c off, norm oper temp. Also see the following ref. http://carnut.com/specs/gen/cad60.html