88-91 heads fit on our motors?

[novaderrik]

i found a place online that is selling some rebuilt Buick V6 heads at a clearance price of $100 a piece. they don't list casting numbers, but this is a circle track supplier so i doubt if they are going to be selling something that only fits on fwd motors.
are these the heads that were used on the TTA? and if so, are they an upgrade and what is needed to make them physically work other than the different header flange?

 

[mikestertwo]

If it's the ones I am thinking of they will bolt on but there are differences. They have a smaller combustion chamber, the valve train and valve covers are different, and you will need custom headers to fit in a Regal. I'm not sure about the accessory bolt holes in the head.