That's perfectly normal. With the timing marks aligned, #6 will be at TDC on the compression stroke, not #1. With #1 at TDC compression, the #6 INTAKE, not exhaust, is just beginning to open. The exhaust has just closed, and the intake is opening. It's called the "split overlap" position on a racing cam because both valves are open quite some distance. Just time the distributor to fire the correct cylinder and everything will work properly. A Chevy V-8 also aligns the timing marks halfway around the firing order from #1, which is also cylinder #6. In that case, it's:
1-8-4-3
6-5-7-2

Your 235 fires:
1-5-3
6-2-4

In both cases, the cam timing marks align with the #6 cylinder on compression. The first time I discovered that, I spent half a day trying to time it differently. The one that really confuses people is a Ford 9-N tractor. It fires 1-2-4-3 instead of 1-3-4-2.
Jerry

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