What's with folks thinking they need to do the flat tappet swap in a roller engine lately? I've seen at least 4 people in the last month with this hogwash.
That sh8t has me concerned.. Ever hear of a re-grind? I think information and vendor lists for that need to become a sticky in the magnum swap section.
If you want lumpy, just lean out the idle a/f adjusters using a mild cam and kick down the idle speed. It's not worth the trade off in low and mid range pull. 230 @ .050 max duration.
My cam is a 292 225 @ .050 112 LSA .525 int/ext lift. Cost was $175 reground at bullet cams. Pulls hard.
Woods 74' Dart walk. - YouTube
Done.