If you were ever in trouble, I would give you all the help you needed.
Can you explain the tense choice for the bolded verb?
How about "all the help you would need" or "all the help you need"?
This phenomenon is called the 'modal preterite' by the author below. Tense backshifting is a way to denote modality in English.
EG: 'If it rained tomorrow, we'd be out of luck.' 'It's time you went home.' 'It would be best you left.'
It is closely related to the were-subjunctive, but many researchers don't consider it to be a subjunctive, because it lacks a unique historical form.
Source: Harsh, Wayne. The Subjunctive in English. 1968. p 110.
The English grammar of Quirk, et al. also covers this phenomenon.
*...I would give you all the help you needed/would need/need.
The first two are grammatical and mean the same thing.
The third is not grammatically correct.