340 or 360???

I have had several small block early a body cars. The only problem I had with a 360 in a 66 valiant. The oil pan from a 273 wont fit on a 360 and the 360 oil pan didn't fit very well in front by the K member. I use a BFH and clearanced the oil pan as best I could...it still hit the K member and would vibrate. There was probably a better oil pan to use. The 273 oil pan will fit a 318 and a 340 just fine. I no longer have that car. I am currently working on a 65 valiant. I will probably build a roller cam 318 with 302 casting heads and a 4" stroker crank. The combo makes 390 inches and I can make it look like a 273 Commando.