removing spark plug tubes from magnum heads and...

hey guys, I have a pair of magnum heads I got for nothing, (it looks like thats exactly what they are worth), well the spark plugs are all rounded off or rotted out from sitting and I can't get them out, Im thinking if i could get the spark plug tubes off then i could get the plugs out. Is there anyway to get the tubes out withought taking a cut off wheel to them?.

Second question
71 stock 318, budget of $600-800. already have a performer intake and carb, is it worth trying to get these magnum heads checked out and try to use. Over the winter I want to put in a cam and headers on the car. I would like to run 9.1 or quicker in the 1/8 mile, car weights 3250 with me in it,3.23 gear. car runs 9.6's and higher now with 2.1 60fts on street tires. I have some drag radials also that I need to get wheels for.

thanks guys