I haven't posted here for years but I thought I would give you my 2 cents on the Atomic 4 and E30-2, whatever their worth... My first boat was an E-27 with an Atomic 4 engine, it was a great engine for power as well as a workhorse, but the maintenance was a pain. In my opinion the main problem was not the gasoline fuel itself (with its obvious drawbacks compare to diesel), but the carburator, which was finicky and had a tendency to gum up if I did not run the engine on a regular basis. Had it been fuel injected, I would be less critical, but after switching to a boat with a diesel engine, I would never go back to a boat with an A4 engine, and I mean never! Now I own an E30-2, which I have sailed in an out of the Bay Area for six years, at times in quite heavy weather. It has been a fantastic boat, and the combination of the cockpit-mounted traveler and transom-hung rudder seems to make it much less prone to weather helm than the E-30+ which I also sailed a lot, and has the same hull but a spade rudder and cabin top-mounted traveler. The only drawback (for coastal cruising only) is its under-powered Yanmar YSM12. You mentioned a worry about developing a crack ahead of the keel stub, which probably originated from a post I made after buying my E30-2 (around 2015). In my case the damage was done and shoddily repaired by the previous owner who unscrupulously did not disclosed it; I made the mistake of conducting only an in-water survey; had I hauled the boat out, the surveyor would have easily identified the shoddy previous repair by soundings. Luckily it was repairable (quite expensive but better than new!) So my recommendation would be to have a full out-of-water survey conducted and not worry about cracks if soundings of the hull are good all around. Also check for water penetration in the deck core around the mast and chainplates. On recommendation by a surveyor after the repair, I also tabbed the starboard bulkhead in the head, below the sink. I am not sure if this location was left untabbed in other E30-2's, but you may want to check that and tab it as necessary for added stiffness. You may also notice some minor mottling outside the hull where the chainplate supports are bonded to the hull; I had those locations carefully surveyed in and out, with no sign of problems, as it turns out these resulted from the manufacturing process on some (maybe all?) of the E30-2's. In any case, it as been a fantastic boat, except for the small engine when trying reach port in a hurry under head winds.