Looking at the pics of the 30" necks, I don't believe they are suitable at all for mounting on a standard body without moving the bridge position by a fair bit. Which on a Strat with pre-routed trem holes, is going to be impossible.
Unless the pictures are wrong (and I don't think they are as the text also states the number of frets as 21), then they are simply scaled-up versions of a standard neck, which means that the bridge has to move back significantly. To fit a standard guitar body, the neck needs to be longer, as well have increased fret to fret distance if the bridge is to remain in the same place. So conversion necks normally need to have more frets fitted to fill the extra space required. A Warmoth 28-5/8" Baritone conversion neck has 24 frets, so a 30" scale neck would either need 25 or 26 frets, or a much larger area of unfretted neck up past the 24th fret.
I'm afraid I really think that you'll have to ask for your money back, as they are not suitable for PBG ST or TL style kits as conversion necks, they are only any use for fitting on bodies custom made for those necks.
I'll drop Adam an email about the necks in general.
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