The 20” case 17749 is my go to for both of my ‘64 A-body Pontiacs, however they’re simply too long to fit in the recess under the back seat floor pan of an F-body.
I used a pair of the 14” case 17734 mufflers on my ‘76 T/A and they were a good fit, I suspect your ‘69 has similar space constraints. They were a little more aggressive sounding than the larger 17749 mufflers but still good for something you’re driving a lot. Smaller 2-1/4” tail pipes would tone them down a bit without sacrificing performance.
Ground clearance with dual exhaust and these fairly large mufflers isn’t that great. If a low profile muffler with good sound quality is available I’d be looking into those. There just isn’t much room under the floors of an F-body.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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