340 with a 273 distributor

Really have to see what it started out as recurved lke most have been is always a crrapshoot. Great example look at say RA distributor listing for a 273 there are prob 50 numbers that it says it fits. Fits yes curved right? Probably not. Drop it in and using a timing tape see where it comes out to is the best bet no way I can answer this without running it up.