Shoebox to Sedan

I am taking the bone stock flathead and T-5 out of my shoebox, The old flathead is running fine but It is stock one barrel and all it don't leak any oil but it smokes somewhat. I would like to wake it up just a little bit like intake carbs and so on,as for it smoking a little bit just leave it alone or what I mean I can drive it about 150 to 200 miles before putting oil in it. How much more does the shoebox weigh than the sedan,Thank's

 

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Whatsa henway?... Oh about 5 lbs.