they're less than 3.5" deep, so a small angled box could easily fit 2 of those in there without having to sacrifice any room. . .as for an amp, since they're 4 ohm SVC, you probably want something closer to pushing 250w @ 2 ohms. . .the sky (and your pocketbook) are the limit on amps that will do that. . .
you could get something as simple as this
JBL, which would probably give each sub a little over 120 wrms. . .
you could even find a quality 2 channel that puts out around 120 per channel. . .that's what i did. . .it may not be the most efficient, but i do like the sound i get out of my subs with my amp. . .