dellow automotive do heaps of bellhousings for the 1u to different boxes now. the toyota auto is very strog and works well also even with a stall. harry kajima from AVO had a 240 with a turbo 265 hemi that i saw at targa tas it was a weapon. even atmo the hemis make good power and all the ancilleries are on the left like an L series. makes life simple.
spring saddle on top saddle on bottom compress spring thru bump and rebound. turn spring over it's still being pushed from same points compressing the spring in the same way.no difference.i was told this by kings springs here in oz when i asked the same question years ago. just get 'em the same way.hope this helps.