Hi, i'm really really curious how 305 heads will work on a 400 small block, i've already opened up the ports abit, i still want to polish the runners etc... they're 416 Castings, 1.84/1.5 valves 58 CC chambers. If any of you guys know or know someone who's done this before let me know... if i dont find anymore info i'll try them out, if they're gay then i'll get better heads... Thanks...