Without looking under the hood, it looks pretty close to stock.

Only the fancy Dayton radial-spoke wheels and the solid walnut dashboard look different from stock...
But if you look closer...

Have a closer look! 25 photos and full specs appear here:
Thomas Ross's 1961 MGA (with Chevy 350 V8 and Corvette suspension...)
So, what do you think of this MGA? Pretty cool, eh?