Another wheel and tire question

[J Dog]

Just bought a '68 plymouth satallite 4 door. One of the hubcaps was missing, so that's my excuse for getting this baby some new shoes. Does anyone know what the widest and/or what backspacing to look for and how wide of a tire I can squeeze underneath her without any rubbing issues (front an back)? I like the looks of a weld draglite, prostar, or rodlite type of rim, but I'm open to suggestions too. Also, does anyone make a reasonable priced full length header (318 motor) that does not hang down so far on the drivers side? I would like to lower the front a little, but the drivers side header on it now is already too low as it is.

Thanks in advance,

J Dog