I bought a set of the 440 stealth heads not long after they came out and haven't had any issues with mine. I did buy a set of TF 240 last winter and picked up nicely with them. For just a street cruiser the stealth heads would be fine, but if you want the extra power I'd recommend the TF. Keep in mine the stealth heads you'll probably be able to use the stock length pushrod where the TF you will need a longer pushrod. I used Crane gold rockers with both heads without any issues. I used both in an all out race motor that I shifted at 6000 and ran a .557-.590 flat tappet MP cams so it's mild by a lot of people standards.
My story is almost the same. Switched from Stealth's to TF 240 and got a very nice power increase. I did also change cam from hyd ft to mild Solid ft (248@.050) but otherwise no other changes. I also use Crane gold rockers on the Trick Flows, and yes, longer pushrods are needed. Good luck
