80-04-03 R2 Para a says "in accordance with AVCO Lycoming Service Bulletin No. 435 dated March 17, 1979" so I am not sure about SB 435B.
SB 435 3/17/79 says "MODELS AFFECTED: All O-320-H Series engines with serial numbers up to and including L-6182-76 and reman. engines shipped prior to March 19, 1979" I have read through the SB and nothing is said about a suffix of T in the S/N.
The AD Does refer to the T suffix in para c3 and the Note following that para about the T having larger lifters but it is not clear how this effects applicability of the AD
I would suggest contacting Lycoming for help.