I just got a 79 K10 that the factory sticker by the radiator says its a 400. The guy I bought it from has no idea if it's still the 400 or if it's a 350. Since I don't have time to find the ## on the engine, I need to know if the cap/rotor/plugs/plug wires will be the same for either engine? It need a tuneup so that I can get it to pass emissions and I'm gonna go get the parts tonight. TIA!!