....Pablo, At www.sdpc2000 a 350 HP/400 TQ 350 Ram-jet is almost $5000 & a 450 HP/550 TQ 502 Big Block is $5800 {no carb or ignition though} {part #12568778}. A 150 more Ft. Lb's of TQ for a grand more??? Why not put in a big block. Lots of room for one in a 70 Chevelle ,,,,,, Plus it's got a steel crank for when 550 TQ isn't enough & you want to add a blower! ;0 Bill