McGrath:
Dreamed/dreamt
Dwelled/dwelt
Kneeled/knelt
Leaned/leant
Leaped/leapt
Learned/learnt
Smelled/smelt
Spelled/spelt
Spilled/spilt
Spoiled/spoilt

(I found them on this list of irregular verbs.)

In all the above cases, modern American usage favors the -ed versions. The -t versions would seem archaic.

Yet we hang onto built, dealt, felt, lent, meant, spent. I don't think I've ever heard builded, dealed, etc., in ordinary speech, but isn't builded in the King James Bible?