SB or BB a body debate

REALLY need help from some mopar guys- I'm debating on a stroked (408 or 440) small block or a 383 or 440 big block

I have the 360 (79 block) and a SB 727 that will be slated if I go the SB route

I also have a BB727 if I go that route but no motor yet BUT I found a 383 block for $100 local

SO what should I do???????????????????

please help me decide-

SB stroker pro's - bolts in with off the shelf parts (mounts/headers/ect/) - is much lighter (bonus for my options devoid Demon)
con's - (I'm thinking 550+hp) - could have short life span- I don't want to "freshen up" the motor every end of season just to keep the motor running good- flat tappet cam...

BB pro's - same HP numbers as SB with a milder build - that's about all I can think of - slant 6 wiring is almost plug and play
con's- custom headers - notching the K member for the oil pump - custom drive shaft (both combo's will need this so that is expected) -

feel free to post pro and cons of either setup that I haven't yet