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They both have their ups and downs, webers are easy to find new parts, dellortos are very hard although a lot of parts are being reproduced these days. If you get 40mm Alfa dellortos (DHLA 40-F/G/H suffix) you will have trouble with lower revs on a smaller than 1.8 - 2L motor as there are too many progression holes causing a lean mix, you can mask this with larger idles. If you can find some universal 40mm dellortos (DHLA 40 no suffix or C/E i think) or 45's then by all means grab them, but for easiness get some webers.

On a road car alfa dellortos are great as you don't have to worry so much about a slightly lean progression phase and they are supercheap to come by.

I would go webers, dowel and match port manifold for starters, then look at bottom end if your not happy with the results. You will also need to get rid of vacuum advance if you go for webers and then get dizzy regraphed to run about 12-15