So heres my problem i have never tried doing this so bare with me the question seems out of wack!!!

can i take a set of stock 350 heads and bolt them to a 305 small block on propane without the worry of the valves smacking into the cylinders and blowing everything out? i know it might sound strange but i have neve tried these things out cause i typically have an engine tore down with the parts sitting right there for the application im am working on you 454 or 350 usaully just the parts rebuilt that came off the project..

thanks for all your input in advance guys..