The AAR I believe you are talking about is on the front part of the block...that has nothing to do with the block being an AAR/TA block....where the casting number is on the driverside of the block the TA340 is included...plus the vin number will tell if it came out of a AAR or TA...plus the sequence number....AAR and TA were made during a short run in March and April 1970
Heads will have offset on the intake rockers...pushrods holes in heads are drilled at an angle...plus the heads ONLY use those mechanical rocker...if it has non adjustable stock rockers...they do not fit a TA head...
