I shoot a '66 carbine in .38 sp. Go for the 158 gr. bullet. No need to buy the "Cowboy Dies" name, as Stu said. Any .38sp dies will work. In 10 years I have reloaded some of my brass many, many times and have never bothered to trim down neck for length with no feeding problems (except once . . .).
If shooting real BP, give it a reasonably hard crimp and every three stages or so run a wet patch down the bore. Word to the wise helps.
I've shot Clean Shot, Triple 7 and Trail Boss. Liked 'em all.
RCJ