are a 90mm and 80mm TB the same bolt patter for bolting up?

I have an edelbrock low profile elbow, but my class only allows an 80mm TB

 

I don't think so. Just port the 80mm?

 

well, what im wondering is if the 80mm will bolt up to my elbow designed for a 90.

 

Stock up through 85mmTB's have a 3 bolt mount, 90mm on up TB's have a 4 bolt mount.
If I'm not mistaken your Edelbrock low profile elbow can mount both, 3 and 4 bolt TB's.
So, yes the 80mm TB should bolt right up.

 

I know the stock TB wont mount up because its too small, thats why I was wondering lol. Doesnt cover up the whole.

 

anybody have a comparison shot of a stock TB and an 80mm TB?

I know the stock TB doesnt cover up the bottom hole. I sloted the mounting holes, and it covers that, but it doesnt quite cover the left side.