The Tman 577 cam is close to the SE 259E cam specs and I had the SE 259E cam in my bike and I hated it.
The Tman 577 cam is a mid-range torque cam and would work better with higher compression builds from what I see and if it acts anything like the SE 259E cam it doesn't come on until the engine hits around 3000 rpm.
On the heavier touring model HD you are better off with a cam that provides low end torque and HP and comes on earlier such as the Woods 222 cam for example.
Save the money on the heads because the head work will only provide minimal results for the money spent.
Just do the cams with new cam bearings and adjustable pushrods and see how you like how the bike runs before tearing the heads off. Lifters are optional because they are easy to replace once the adjustable pushrod are in your bike.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.