Andy
My Ace Bristol (BEX 375) was raced from 1959 to 1963 with a tuned exhaust. It has the "LeMans" exhaust with six 1.375 to two 1.75 to one 2", a short muffler and the side exhaust. I have period racing pictures, trophies, dash plaques and entrant lists. My father raced the car so I can confirm this is a period manifold.
For people looking for SCCA racing pictures, I got a few from Richard Pelatowski in Florida. He was a photographer in the early 60's and went to SCCA races. He was selling off his negatives to finance retirement. His address was 211 N.W. Jefferson Circle, St. Petersburg, FL 33702. His e-mail was RPELL@AOL.COM. I haven't talked to him in years. He could be a source for some pictures of Aces.
Peter Stanwicks
BEX 375