I'd say preference. I have the BBK bolt ins, but I welded them in. I think the bolt ins are better to weld cause they contour the existing frame.
good luck 
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88 Notch Natually aspirated 306 600 carb Edelbrock Victor Jr. Intake and Performer RPM heads 11.5 comp. ATI C-4 8" 4200 stall 4:10's 28x10.5 M/T MAC longtubes/prochamber Dynomax Race magnumss dumped, Caged and ready to go!!! 11.8@115
And remember friends don't let friend drive MOPARS!!!
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