Don't necessarily shun prop strike damage history...
IF the prop and engine were properly repaired (or overhauled), and this was properly documented by a reputable shop, a prop strike shouldn't be considered a show-stopper, and can actually be a good value. If there was structural damage, then things can be more problematic; but again, if PROPERLY repaired, may also be just fine. As with any home-built, properly repaired is judgment call as is properly constructed in the first place!
RV-4's can suffer heavy landing damage without a prop strike (some of which can be spotted by looking for buckling or deformity in the lower stainless firewall corners) and general wear and tear where the main gear legs attached to the engine mount (usually in the form of welds cracking).
68" Wooden propellers were originally envisioned for the "short gear" RV-4, but the need for speed as well as constant speed types has increased the typical prop diameter over time (although a 68" two-blade or even smaller three-blade can provide plenty of performance). The "long gear" is a logical engineering evolution of the type, so, therefore good; but as Rick said above, shouldn't be considered a factor unless it's fitted with a really large prop; and 74" would meet that criteria!
Big props and big engines also contribute to "heavy nose" syndrome for RV-4's, but that's a matter of personal preference as well...some of us like light-weight airplanes with a light nose simply due to the handling characteristics (yup, can limit rear cockpit payload capability); but even light noses are subject to fatigue damage over time (perhaps more prevalent if the airplane is operated off of grass)...we had to re-weld the lower engine mount corners/gussets at the 1200 hour point due to cracking, which is not atypical.
Enjoy the search!
Vac