maybe. it depends on how well it's currently tuned and what type of driving you do. but the answer is usually yes. however a problem with acceleration may have more to do with carb set up.
for me any vehicle that spends real time being street driven, is generally better off with vacuum advance. the mechanical advance responds strictly to engine RPM while the vacuum advance makes its adjustments based on engine load, which obviously varies in regular driving.
don't get me wrong, mechanical advance can be tuned to work well and does so under specific driving conditions or combinations.
