I'm new to the forum , I purchased a 69, 427 trying to figure out what it is , the vin#194379S708090 , The carb is an Holy 850 # R4781 , Head has 3964291 , Block has 3963512 & CE972556, the heads have other markings , HI-perf ,GM1T, F15-70 on the outside of the heads its stamped R. Williams, it has a rock crusher trans #3925660 and 3088336 general motors, alternator #1100882. It has the L88 Flairs and hood < I hope some one out there can help me figure it out. Thanks Lee

Alternator number is off a 69 427 430 or 435.

Corvette Black Book doesn't have those other numbers.

I'd google all those numbers and see what you can find.