The first year for a tri power Cadillac was 1958, see the performance manifold numbers below:
1455104 49 331 two barrel
1456741 50-51 331 two barrel
1463414 52-55 331 single quad
1463205 is a 1955 dual quad 331
1464580 is a 1956 dual quad 365
1469263 is a 1957 dual quad 365
1465950 is a 1957 dual quad 365
1469689 is a 1958 Tri-Power 365 
1472225 is a 1959 tri power 390
3512080 is a 1960 tri power 390
I do not know what the other numbers are:
1469262-2 ?
1465061-1
14692631-2
what are you going to do with the tri power?
Kenneth Gray