Identifying cast iron trickflow heads

I was wondering if anyone on here new anything about the cast iron high port trickflow heads. I bought a 89 notch has a 306 lunati cam 560-576lift 310 dur. all forged internals 1.6 comp cam rockers. its a carbed set up. The guy told me it has the old trickflow high ports i took the valve covers off cause im swapping out the cam and puting a efi set up back in i just need to no what heads i have on this thing to get another cam the only markings i see on these heads without taking them off are. UAN and underneath that is DU on one head and on the other MAN or WAN with a DU underneath that. they are the only letters i see no other markings is the anything else i can identify on these heads to find out what they are? Please any help

Hey Yea i actually found an old trickflow broshure online the heads i have are the actual old trickflow highports they didnt have the tfs------ castings on those heads back then but the heads are identical under the valve cover along with the letter castings in the center of the head. thanks for the reply