I went on the All 32 Run in Blowing Rock, NC in my avatar this past weekend (coverage is on the HAMB). I was one of only 2 flathead cars in the group of 31 cars and I kept up with all of them OHV engines and never had a problem. Many were amazed at how she performed and then I tell them that other than 2 deuces on a Y adapter running progressive linkage, it's a stock 1940 engine. True, it's not a 221 like you are talking about here but hats off to Henry as he really did make one fine little flattie for us so we can continue to play with them after all of these years!
Oh - and then I buzzed 350 miles to home @ 70-75 MPH. Man am I having fun with this car ....