'72 340 needs 030 pistons help

I picked up a 340 that was seized. story was it was bought out of a junk yard in '81 and tucked away for a "someday" build. well that never happened and it was put up for sale. I bought it and took it home to rebuild and hook up to a four speed for my duster. the four speed needs some stuff too, but more on that later. 5 of the bores are rusted bad, so i think i need to forget about a stock bore and go with 030 over slugs. so if anyone has a set of 030 pistons(new or used, high perf or stock) i would be very intrested in them. used parts are my favorite so whatever u have may not be that bad, l.o.l. . it has floating pins with clips, i have the stock iron intake manifold that i would be willing to trade (if local) towards them as Im not going to need it. I'm in buffalo new york. The four speed i have is an (overdrive) unit? its out of a 77 aspen. im looking for the correct trans levers and rods to attach to my shifter. any help would be great as i would like to get this thing running soon. thanks Roland.