Im redoing my exhaust on my 75 Corvette with a th400 and SBC 355. Im looking at installing a x or an h pipe. Which one to go with? Im looking at this one from summit.

H Pipe
Summit SUM-642025: Summit Balance Tube Kits - summitracing.com

X pipe
Summit SUM-642125: Summit Universal X-Pipe Kits - summitracing.com

Thanks in advance.