Jarvo2

After a complete tune-up and adjusting the SU's on my stock '72 I am now experiencing a backfiring sound coming out of my exhaust when I decelerate (cruising at 40mph, let off the gas & leave it in gear). The carbs appear to have the proper air/fuel mixture as per the tip of raising the valve 1/16th of an inch to hear a slight RPM increase and then return to normal. Vacuum tests are showing great results (steady needle 'in the green') and I have steady power under load without a backfire. Idle is steady at ~750RPM and the SU's are synchronized. If I lean the SU's out anymore than I have right now the car boggs down during acceleration. Any suggestions on what to check next? I appreciate any help you can give!

I really need to replace all of the vacuum hoses on my '72 and after searching the web I can't find all of the hoses (not even MSA). Has anyone used the generic Silicone hose kits or injector/fuel line hoses? I know I won't get the pretty bends, but I'm thinking as long as I keep the arc wide enough I should be fine. Any suggestion on what sizes (I.D.) I'll need? Thanks. - Dave